Chapter 9. Drag and Drop

So far in this book, we've covered the complete range of fully released interface widgets and over the next four chapters we're going to shift our focus to the core interaction helpers. These components of the library differ from those that we've already looked at in that they are not physical objects or widgets that exist on the page.

Instead, they give an object a set of generic behaviors to suit common implementational requirements for dynamic and engaging websites. You don't actually see these components on the page, but the effects that they add to different elements, and how they cause them to behave can be easily seen. These are low-level components as opposed to the high-level widgets that we looked at in the first part of this book. There are currently five different interaction helpers, each catering for a specific interaction.

They help the elements used on your pages to be more engaging and interactive for your visitors, which adds value to your site and...